@article{EU_1975-1976__2_a26,
     author = { },
     title = {\ensuremath{\Pi}o\ensuremath{\sigma}o\ensuremath{\sigma}\ensuremath{\tau}\'{o}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma}
},
     pages = {14-15},
     publisher = {mathdoc},
     volume = {2},
     year = {1975-1976},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EU_1975-1976__2_a26/}
}